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Bletchley Park in the UK is home to the National Museum of Computing - they're both FANTASTIC to visit.

https://en.wikipedia.org/wiki/The_National_Museum_of_Computi... has a working rebuild of a Colossus Mark 2.

Computer History Museum in Mountain View, CA https://en.m.wikipedia.org/wiki/Computer_History_Museum

Computer Museum of America in Atlanta, GA https://en.m.wikipedia.org/wiki/Computer_Museum_of_America

Not a computer museum but I have a soft spot for the Connections Museum in Seattle, WA https://en.m.wikipedia.org/wiki/Connections_Museum

CHM has been my favorite to visit every time I'm in the area. I do wish they would have more modern stuff though. Especially the period between 90s to 2010s. There are some parts (first iPhone, Palm Pilot), but I wish they would continue because the internet age has been incredibly important.

A secret amazing museum: System Source just north of Baltimore: https://museum.syssrc.com/. Much more amazing than the website makes it seem!